Opinions from T. S. Kelly 1998

  • 'Calippus martini belongs to Calippus'
  • 'Cormohipparion goorisi is recombined as Merychippus goorisi'
  • 'Equus cumminsii [misspelled as Equus cuminsii] belongs to Equus'
  • 'Equus minutus is a subjective synonym of Nannippus peninsulatus'
  • 'Equus simplicidens belongs to Equus'
  • 'Hipparion mohavense is a subjective synonym of Cormohipparion occidentale'
  • 'Hippidium interpolatum is recombined as Dinohippus interpolatus'
  • 'Hippidium spectans is recombined as Dinohippus spectans'
  • 'Hippotherium isonesum is recombined as Acritohippus isonesus'
  • 'Merychippus calamarius stylodontus is recombined as Acritohippus stylodontus'
  • 'Merychippus campestris is a subjective synonym of Pliohippus mirabilis'
  • 'Merychippus carrizoensis is recombined as Parapliohippus carrizoensis'
  • 'Merychippus isonesus tertius is recombined as Acritohippus tertius'
  • 'Merychippus mirabilis is recombined as Pliohippus mirabilis'
  • 'Merychippus sumani belongs to Merychippus'
  • 'Onohippidium belongs to Equidae'
  • 'Onohippidium galushai belongs to Onohippidium'
  • 'Parapliohippus belongs to Equini'
  • 'Parapliohippus is a subjective synonym of Pliohippus' according to Evander 1997
  • 'Pliohippus (Astrohippus) stockii is recombined as Astrohippus stockii'
  • 'Pliohippus (Pliohippus) mexicanus is recombined as Dinohippus mexicanus'
  • 'Pliohippus bakeri is a subjective synonym of Dinohippus interpolatus'
  • 'Pliohippus circulus is recombined as Calippus circulus'
  • 'Pliohippus edensis is a subjective synonym of Dinohippus leidyanus'
  • 'Pliohippus fairbanksi is a subjective synonym of Pliohippus tantalus'
  • 'Pliohippus francescana is a nomen dubium'
  • 'Pliohippus hondurensis is recombined as Calippus hondurensis'
  • 'Pliohippus leardi is recombined as Dinohippus leardi'
  • 'Pliohippus leidyanus is recombined as Dinohippus leidyanus'
  • 'Pliohippus lullianus is a subjective synonym of Pliohippus pernix'
  • 'Pliohippus nobilis belongs to Pliohippus'
  • 'Pliohippus osborni is a subjective synonym of Dinohippus leidyanus'
  • 'Pliohippus pernix belongs to Pliohippus'
  • 'Pliohippus proversus is a nomen dubium'
  • 'Pliohippus robustus is a subjective synonym of Pliohippus pernix'
  • 'Protohippus coalingensis is a nomen dubium'
  • 'Protohippus fossulatus is recombined as Pliohippus fossulatus'
  • 'Protohippus pachyops is a subjective synonym of Pliohippus fossulatus'
  • 'Protohippus simus is a subjective synonym of Protohippus supremus'
  • 'Protohippus supremus belongs to Protohippus'
  • 'Protohippus tantalus is recombined as Pliohippus tantalus'
  • 'Protohippus tehonensis is recombined as Pliohippus tehonensis'
  • 'Stylonus is a nomen dubium'
  • 'Stylonus seversus is a nomen dubium'